Merge pull request #1682 from AlgorithmWithGod/ksinji

[20251215] BOJ / G5 / 여러분의 다리가 되어드리겠습니다! / 강신지

Author: ShinHeeEul

ksinji/202512/15 BOJ 여러분의 다리가 되어드리겠습니다!.md

@@ -0,0 +1,42 @@
+```java
+import java.io.*;
+import java.util.*;
+
+public class Main {
+    static int[] parent;
+
+    static int find(int x) {
+        if (parent[x] == x) return x;
+        return parent[x] = find(parent[x]);
+    }
+
+    static void union(int a, int b) {
+        a = find(a);
+        b = find(b);
+        if (a != b) parent[b] = a;
+    }
+
+    public static void main(String[] args) throws Exception {
+        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+        int n = Integer.parseInt(br.readLine());
+
+        parent = new int[n + 1];
+        for (int i = 1; i <= n; i++) parent[i] = i;
+
+        for (int i = 0; i < n - 2; i++) {
+            StringTokenizer st = new StringTokenizer(br.readLine());
+            int a = Integer.parseInt(st.nextToken());
+            int b = Integer.parseInt(st.nextToken());
+            union(a, b);
+        }
+
+        int root = find(1);
+        for (int i = 2; i <= n; i++) {
+            if (find(i) != root) {
+                System.out.println(1 + " " + i);
+                return;
+            }
+        }
+    }
+}
+```